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Related Questions:

You should have an EVAP leak test done . It could be a leaking purge valve , you could need a new gas cap as well or it could be the fuel filler neck . or assorted hoses or the fuel tank pressure sensor . If the check engine light is lit there will be a code . DTC P0442: Evaporative Emissions (EVAP) System Small Leak Detected or
DTC P0455: Evaporative Emission (EVAP) System Large Leak
DTC P0446: Evaporative Emissions (EVAP) Vent System Performance
You have to jack up the vehicle , the purge valve is attached to the engine behind the A/C compressor .

The indicator is actually telling you there is a leak in the evap system. This can be caused by a loose cap, on cars that have them; but it will come on for any leak in the system. The capless fuel pipe may not be sealing, or any hose in the system may be leaking. Check the small hoses connected to the engine intake manifold--one of those is the purge line, which is part of the evap system. The rest of the system includes a charcoal canister and a vent line from the fuel tank. There may also be a vent valve connected to the canister. A leak in any of these can cause the light to stay on and may affect the operation of the engine, if the leak is large.

The metal flap should not trigger the sensor. Once you tighten the gas cap you should clear the code and see if it comes back. Otherwise it will take a while to go away.
If it does come back even though the gas cap is tight it could be the rubber seal around the gas cap replacing that can sometimes fix this issue also.

what code is it?po440,p0455?If it is one of those codes it means you have a large evap system leak not a vacuum leak by the engine.the evap leak is most likely a inop vent valve or a fuel cap not properly sealing.

Most likely an evap system fault code stored in engine computer. Best bet and cheapest thing is go to the dealer and buy a new cap. Install the cap and drive the car for a few days if the light goes off, your all set, if not you need to check for codes. Then probably find a leak or a faulty evap vent valve or purge valve.

emission problems are common, there is a evap canister underneath near the tank. also sensor built onto it. sometimes water get into there especially seeing the year they crack. its best to go to a tech who expeience with th evap system.

the code for gas cap? is also a code for small leak in evap system which includes the fuel /vent lines and canister check that the lines weren't damaged when cat was put in also check coolant sensor in reservoir connections runs by exhaust system